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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Company's estimates of fair value differ from the carrying amounts |  |  |  |
Unsecured Notes Payable, Carrying Amount | $ 1,518,382 bdn_UnsecuredNotesPayableNetOfDiscountsCarryingAmount |  | $ 1,518,108 bdn_UnsecuredNotesPayableNetOfDiscountsCarryingAmount |
Variable Rate Debt, Carrying Amount | 278,610 bdn_VariableRateDebtInstrumentsCarryingAmount |  | 278,610 bdn_VariableRateDebtInstrumentsCarryingAmount |
Mortgage notes payable, Carrying Amount | 650,545 us-gaap_SecuredDebt |  | 654,590 us-gaap_SecuredDebt |
Notes Receivable, Carrying Amount | 0 us-gaap_NotesReceivableGross | [1] | 88,000 us-gaap_NotesReceivableGross | [1]
Unsecured Notes Payable, Fair Value | 1,584,451 bdn_UnsecuredNotesPayableNetOfDiscountsFairValue |  | 1,593,212 bdn_UnsecuredNotesPayableNetOfDiscountsFairValue |
Variable Rate Debt, Fair Value | 257,512 bdn_VariableRateDebtInstrumentsFairValue |  | 257,188 bdn_VariableRateDebtInstrumentsFairValue |
Mortgage notes payable, Fair Value | 695,228 bdn_SecuredDebtPrincipalBalanceOutstandingFairValueDisclosure |  | 707,241 bdn_SecuredDebtPrincipalBalanceOutstandingFairValueDisclosure |
Notes Receivable, Fair Value | $ 0 us-gaap_NotesReceivableFairValueDisclosure | [1] | $ 87,692 us-gaap_NotesReceivableFairValueDisclosure | [1]
[1] | On January 30, 2015 the mortgage note was repaid. For further information regarding the mortgage note, see Note 2, "Summary of Significant Accounting Policies," included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2014

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- Definition Secured Debt Principal Balance Outstanding Fair Value Disclosure. + References No definition available. + Details
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- Definition Unsecured notes payable, net of discounts, Carrying Amount. + References No definition available. + Details
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- Definition Variable Rate Debt Instruments, Carrying Amount. + References No definition available. + Details
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- Definition Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph b -Article 5 + Details
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- Definition Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Subparagraph 3 -Article 9 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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